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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fed20e3331d17f494e8a88299c3b45176575e6e802fecb0879182cc889cc52e0' 
  AND token = '9hUt9vIZ9bWIShcFN2Zuppk+RV6ecM4CF/ujyjFQ4AU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}